So there is lots of good info on the site about upgrading the systems in the Edges. I will just add a few things from my experience in my upgrade.
I have a 2015 Sport with the Sony upgraded system but a lot of this info will apply to the other models.
Recently IdataLink released their Maestro AR module which allows you to remove the factory amp and add compatible aftermarket amps. You can google this module as they have a good video explaining how it works. But basically for the first time you can add your aftermarket amps pre factory amp instead of post (IE high level in). I snapped a pic in the middle of the installation the wires are a mess but the end result they are all nice and tidy. I added the Audison 8.9 which is an 8 channel amp with built in DSP(you need some sort of DSP when adding the AR module). The Hertz a mono block for the sub and basically a slave from the Audison. The little black box at the bottom is the AR module. The amps are installed where the factory amp used to be so the panel hides the installation.
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Just a quick tip on running the power wire. There is a nice big grommet to go through right under the dash above the brake, it come out on the backside of the brake hydraulics that way you don't need to drill.
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I also upgraded the front speakers to the Focal PS165's. The tweeter as many have said will not fit in the factory location so I installed it in the small removable panel at the top of the door, I figure this panel will be cheap and easy to replace when I sell the car.
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Lastly our factory sub box will hold an 8 inch sub so I threw a Hertz in there.
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All in all the sound is amazing compared to stock, the factory DSP is very muddy and hard to get nice clear sound but its nice and clear onthe Audison DSP. The only thing is the sub, I am not quite happy with the sound. I figure the factory box is between .5 and .6 cubic ft and the sub likes a smaller box closer to .3 so I may change to to a better sub in the future. If you are wondering the factory sub appeared to be a dual voice coil 2ohm sub when i tested it.
Lastly one nice thing about the AR module is it takes the factory bass mid and treble settings on your factory head unit and changes them to speaker control. IE bass = sub volume, mid = mid speaker volume and treble = tweeter volume.